BMJ 2002;325:805 ( 12 October )

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Socioeconomic position in childhood and adulthood and insulin resistance: cross sectional survey using data from British women's heart and health study

Debbie A Lawlor, MRC research training fellowShah Ebrahim, professorGeorge Davey Smith, professor

Department of Social Medicine, University of Bristol, Bristol BS8 2PR

Correspondence to: D A Lawlor d.a.lawlor{at}bristol.ac.uk

Objective: To assess the associations between childhood and adulthood social class and insulin resistance.
Design: Cross sectional survey.
Setting: 23 towns across England, Scotland, and Wales.
Participants: 4286 women aged 60-79 years.
Main outcome measures: Insulin resistance and other cardiovascular disease risk factors.
Results: Belonging to manual social classes in childhood and in adulthood was independently associated with increased insulin resistance, dyslipidaemia, and general obesity. The association between childhood social class and insulin resistance was stronger than that for adult social class. The effect, on insulin resistance and other risk factors, of belonging to a manual social class at either stage in the life course was cumulative, with no evidence of an interaction between childhood and adult social class. Women who were in manual social classes in childhood remained at increased risk of insulin resistance, dyslipidaemia, and obesity---even if they moved into non-manual social classes in adulthood---compared with women who were in non-manual social classes at both stages.
Conclusions: Adverse social circumstances in childhood, as well as adulthood, are strongly and independently associated with increased risk of insulin resistance and other metabolic risk factors.

What is already known on this topic
Poor childhood social circumstances are, independently of adult social circumstances, associated with increased cardiovascular disease risk

They are associated with some components of the insulin resistance syndrome, and adverse childhood environmental factors, possibly poor nutrition, may lead to insulin resistance and to adult cardiovascular disease

Evidence on the association between childhood social circumstances and insulin resistance in adulthood, and between childhood social circumstances and cardiovascular disease risk factors in women, is scarce

What this study adds
Belonging to manual social classes in childhood and in adulthood is independently associated with increased insulin resistance, dyslipidaemia, and obesity in older women

Women who were in manual social classes in childhood remained at increased risk of insulin resistance, dyslipidaemia, and obesity, even if they had moved into non-manual social classes in adulthood





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Rapid Responses:

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The findings of Lawlor, et al., may be explained by increased testosterone.
James M. Howard
bmj.com, 11 Oct 2002 [Full text]



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